Mineral containing silicon, oxygen, and usually one or more other elements

• carbonate
• halide
• silicate
• sulfate

A valuable, rare mineral

• ore
• gem
• rock
• bling

A naturally occurring, inorganic solid

• mineral
• rock
• coal
• magma

How light is reflected off a mineral

• streak
• color
• luster
• fracture

Measure of how easily a mineral can be scratched

• fracture
• cleavage
• hardness
• streak

Mineral mined at a profit

• ore
• luster
• silicate
• rock

Characteristic observed without changing the identity of the material

• luster
• color
• physical property
• specific gravity

Breakage along smooth, flat planes

• fracture
• cleavage
• streak
• ore

The color of a mineral's powder

• color
• streak
• luster
• powder

Breakage along rough or jagged edges

• cleavage
• fracture
• streak
• luster